[On the characteristics of geographical variation in some mammal species from the north-east of Siberia (clinal variation and the concept of subspecies).] Karlajtis, M.E.[Ed]. [Report of the scientific session on the results of work done during 1970, 15-17 March 1971. Thesis reports.], Publisher name and address unknown, 1971: 1-32. Chapter pagination: 31. 31 [Zoological Record Volume 120]